The software is based on decades of experience in bearing development and rotor dynamics. The code has been developed since 1976. The recent developments include improvements and validations of program functions supported by the TECS program (Technical Enhancements and Customer Support) taking into account the actual customer and market needs. The implementation of thrust bearings and sealing systems is continuously improved and further developed together with radial tilting pad bearings.
The main benefit of the DYNROT program is a quick and highly simplified interaction between the bearing design and rotor dynamics. The user can provide quick and effective design changes and evaluate theirs impact within a few seconds using comparison tools.
History of the development starts in the 1980s when the State Research Institute for Machine Design (SVUSS) Bechovice in cooperation with the Research Institute for Food Processing and Refrigerating (VUPCHT) Hradec Kralove started first attempts for a gas bearing rotor support.
Use of aerostatic bearings was not viable due to rotor instability at higher speeds. That is why tilting pad aerodynamic bearing was developed in 1981, designed in such a way that it was possible to adjust bearing clearance during assembly and in that way reduce requirements for manufacturing accuracy.
Newer bearing design from 1982 brought also the possibility of bearing properties adaptation to operating conditions due to elastic support of a single pad (see the picture). This type of bearings enabled to achieve the projected maximum speed of 300 000 rpm.
A function model of an expansion turbine with the braking power of 1 to 2.5 kW was long-term tested in VUPCHT in 1984 and later several prototypes of turbines were supplied to He Liquefiers for the Linde Company. Around 1987, turbine production was taken over by PBS Velka Bites who supplied more than 300 turbines of different types all over the world. Operation parameters were gradually increased up to the present maximum speed close to 350 000 rpm.
In 2014, a helium expansion turbine with the breaking power of 10 kW and the maximum operating speed of 182.000 rpm was designed and successfully tested.
The accumulated know-how gained from such a long history of projects has been gathered, compiled and optimized into a common knowledge base accessible in the form of the DYNROT system, which is offered by the Sobriety s.r.o. company in a price effective package.
The gas lubricated bearing and sealing system design module consists from the following sub-modules.
The hydrodynamic bearing design module consists from the following sub-modules.Journal bearings:
Module for providing operational balancing. The module allows evaluation of balancing parameters based on the measurements provided by a speed sensor and shaft motion sensors or accelerometers. The module allows to process data from sensors to evaluate balancing locations. With an additional balancing hardware DBB (DYNROT BALANCING BOX) the balancing operation can be done in real time based on a speed sensor and 2 accelerometers or shaft motion sensors.